EBK COMPUTER SYSTEMS
3rd Edition
ISBN: 8220101459107
Author: O'HALLARON
Publisher: YUZU
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Chapter 9.9, Problem 9.7PP
Program Plan Intro
Dynamic allocator:
Dynamic allocator keeps the heap as a group of several size blocks; each block is an attached portion of virtual memory which is allocated or free.
- An allocated block has been clearly kept for use by the application.
- A free block is offered to be allocated.
Two types of allocators:
- 1. Explicit allocators
- 2. Implicit allocators
Explicit allocators:
Explicit allocators need the application to explicitly free any allocated blocks.
Implicit allocators:
Implicit allocators is the method of automatically releasing vacant allocated blocks. This is also known as garbage collection.
Implicit free list:
In this method, a block contains one word header, payload and additional padding. The header encrypts the block size, which contains header and padding; and check the block is allocated or free.
- If the arrangement is single-word, the block size is constantly a multiple of “4” and the low-order bits of the block size are always zero.
- If the arrangement is double word, the block size is constantly a multiple of “8” and the low-order bits of the block size are always zero.
- Thus, essential to store only the high-order “29 bits” of the block size, freeing the remaining “3 bits” to encrypt other information.
- Here, smallest significant bits is using to represent the block is allocated or free.
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Chapter 9 Solutions
EBK COMPUTER SYSTEMS
Ch. 9.2 - Prob. 9.1PPCh. 9.3 - Prob. 9.2PPCh. 9.6 - Prob. 9.3PPCh. 9.6 - Prob. 9.4PPCh. 9.8 - Practice Problem 9.5 (solution page 882) Write a C...Ch. 9.9 - Prob. 9.6PPCh. 9.9 - Prob. 9.7PPCh. 9.9 - Prob. 9.8PPCh. 9.9 - Prob. 9.9PPCh. 9.9 - Prob. 9.10PP
Ch. 9 - Prob. 9.11HWCh. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Given an input file hello.txt that consists of the...Ch. 9 - Determine the block sizes and header values that...Ch. 9 - Prob. 9.16HWCh. 9 - Prob. 9.17HWCh. 9 - Prob. 9.18HWCh. 9 - Prob. 9.19HWCh. 9 - Write your own version of malloc and free, and...
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